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range.hpp

template<typename T> struct range_iterator {
    T pos;

    T& operator*() { return pos; }

    range_iterator& operator++() { return ++pos, *this; }

    bool operator!=(const range_iterator& other) { return pos != other.pos; }
};

template<typename T> struct range_wrapper {
    using iterator = range_iterator<T>;

    T begin_;
    T end_;

    iterator begin() { return { begin_ }; }
    iterator end() { return { end_ }; }
};

template<typename T1, typename T2> auto range(T1 begin, T2 end) {
    using common_type = typename std::common_type<T1, T2>::type;
    return { static_cast<common_type>(begin), static_cast<common_type>(end) };
}

int main() {
    for (auto val : range(0, 10)) print(val);
}